import cadquery as cq
w0=cq.Workplane('ZX',origin=(0,-28,0))
r=w0.workplane(offset=46/2).moveTo(-9,59.5).box(90,81,46).union(w0.sketch().segment((40,-100),(54,-100)).segment((54,-51)).arc((47,-51),(40,-48)).close().assemble().finalize().extrude(57))